CN204490382U - Folding arm lorry-mounted crane fluid control moment limiting system - Google Patents
Folding arm lorry-mounted crane fluid control moment limiting system Download PDFInfo
- Publication number
- CN204490382U CN204490382U CN201520017730.2U CN201520017730U CN204490382U CN 204490382 U CN204490382 U CN 204490382U CN 201520017730 U CN201520017730 U CN 201520017730U CN 204490382 U CN204490382 U CN 204490382U
- Authority
- CN
- China
- Prior art keywords
- valve
- hydraulic fluid
- fluid port
- bidirectional balanced
- communicated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Abstract
The utility model discloses a kind of folding arm lorry-mounted crane fluid control moment limiting system.First luffing controls connection, the second luffing controls connection, extension and contraction control connection is communicated with one-way balance valve, the first Bidirectional balanced valve, the second Bidirectional balanced valve respectively; One-way balance valve, the first Bidirectional balanced valve, the second Bidirectional balanced valve are communicated with the first amplitude oil cylinder, the second amplitude oil cylinder, telescopic oil cylinder respectively; Moment inhibitor valve three off-load hydraulic fluid ports are communicated with telescopic oil cylinder rodless cavity with the first amplitude oil cylinder rod chamber, the second amplitude oil cylinder rodless cavity respectively by one-way balance valve, the first Bidirectional balanced valve, the second Bidirectional balanced valve.The beneficial effects of the utility model are: moment inhibitor valve is fluid control, and without the need to controller and sensor, system is simple, cost is low; Explosion relief valve can after booster locking, prevent oil cylinder stall from falling, ensure safety performance; Compulsory commutation power limit state, realizes emergency operation.
Description
Technical field
The utility model relates to a kind of moment limiting system, is specifically related to a kind of folding arm lorry-mounted crane fluid control moment limiting system.
Background technology
In recent years, along with the development of market, technology, the load-carrying ability of lorry-mounted crane improves constantly, and arm-folding crane increases day by day in the application of China, also day by day improves the requirement of its job safety.The effect of moment limiting system limits operation torque, plays the effect of safety guard-safeguard.Therefore, moment limiting system, as the topmost security protection system of lorry-mounted crane, becomes the research emphasis of lorry-mounted crane gradually.
In prior art, a large amount of elaboration is carried out to force moment of crane restraint device, as proposed a kind of moment limiting system comprising Sensor section, treater part and actr part in patent CN102653380A, CN201458599U, by weight sensor, length measurement sensor, angular transducer etc. to crane hoisting moment Real-Time Monitoring, by Programmable Logic Controller, monitoring data calculated, judge, process, carry out moment restriction by unloading electromagnetic valve, ensure safe operation; Propose a kind of limiter of moment comprising power supply, data acquisition unit, data processing unit, data display unit and control unit in patent CN101628692A, in conjunction with hoisting, the electromagnetic valve of the action such as luffing realizes moment restriction; Propose a kind of moment method for limiting comprising limiter of moment and controller in patent CN103323166A, detected by limiter of moment and send non-super torque signals or super torque signals, sending corresponding safety method signal by controller, realize moment restriction.But, prior art is adopt sensor collection signal, then controller to carry out Calculating Torque during Rotary and judgement substantially, problems such as finally being realized moment limited by the perform an action mode of restriction of the hydraulic pressure block of valve, there is system complex, component number is many, cost is high and reliability is low.
Lower for China's folding arm lorry-mounted crane electrifing degree, mostly be M/C, cost control is strict and the sense of security of users the is lower market status, need the moment limiting system developing a kind of high safety rate, high reliability and low cost.
Summary of the invention
For above-mentioned prior art Problems existing, the utility model provides a kind of folding arm lorry-mounted crane fluid control moment limiting system, and without the need to controller and sensor, system is simple, cost is low, ensures safety performance meeting under normal usage function prerequisite.
To achieve these goals, a kind of folding arm lorry-mounted crane fluid control moment limiting system of the present utility model, comprises the first luffing and controls connection, the second luffing control connection, extension and contraction control connection, moment inhibitor valve, one-way balance valve, the first Bidirectional balanced valve, the second Bidirectional balanced valve, the first amplitude oil cylinder, the second amplitude oil cylinder and telescopic oil cylinder;
First luffing controls connection and comprises the first change-over valve and secondary by pass valve, and be provided with luffing first hydraulic fluid port and luffing second hydraulic fluid port, secondary by pass valve is arranged on the oil circuit between luffing first hydraulic fluid port and system oil return mouth;
One-way balance valve is provided with outside hydraulic fluid port: one-way balance valve first hydraulic fluid port, one-way balance valve second hydraulic fluid port, one-way balance valve the 3rd hydraulic fluid port, one-way balance valve the 4th hydraulic fluid port and pressure signal hydraulic fluid port, one-way balance valve second hydraulic fluid port is communicated with one-way balance valve the 4th hydraulic fluid port, pressure signal hydraulic fluid port is communicated with one-way balance valve the 3rd hydraulic fluid port, one-way balance valve the 3rd hydraulic fluid port is communicated with the first amplitude oil cylinder rodless cavity, and one-way balance valve the 4th hydraulic fluid port is communicated with the first amplitude oil cylinder rod chamber;
Second luffing controls connection and comprises the second change-over valve, is provided with two luffing first hydraulic fluid ports and two luffing second hydraulic fluid ports;
First Bidirectional balanced valve is provided with the first Bidirectional balanced valve first hydraulic fluid port, the first Bidirectional balanced valve second hydraulic fluid port, the first Bidirectional balanced valve the 3rd hydraulic fluid port and the first Bidirectional balanced valve the 4th hydraulic fluid port, first Bidirectional balanced valve first hydraulic fluid port is communicated with two luffing first hydraulic fluid ports, first Bidirectional balanced valve second hydraulic fluid port is communicated with two luffing second hydraulic fluid ports, first Bidirectional balanced valve the 3rd hydraulic fluid port is communicated with the rodless cavity of the second amplitude oil cylinder, and the first Bidirectional balanced valve the 4th hydraulic fluid port is communicated with the rod chamber of the second amplitude oil cylinder;
Extension and contraction control connection comprises the 3rd change-over valve, is provided with flexible first hydraulic fluid port and flexible second hydraulic fluid port;
Second Bidirectional balanced valve is provided with the second Bidirectional balanced valve first hydraulic fluid port, the second Bidirectional balanced valve second hydraulic fluid port, the second Bidirectional balanced valve the 3rd hydraulic fluid port and the second Bidirectional balanced valve the 4th hydraulic fluid port, second Bidirectional balanced valve first hydraulic fluid port is communicated with flexible first hydraulic fluid port, second Bidirectional balanced valve second hydraulic fluid port is communicated with flexible second hydraulic fluid port, second Bidirectional balanced valve the 3rd hydraulic fluid port is communicated with the rodless cavity of telescopic oil cylinder, and the second Bidirectional balanced valve the 4th hydraulic fluid port is communicated with the rod chamber of telescopic oil cylinder;
Moment inhibitor valve comprises the first check valve, second check valve, 3rd check valve, unloader valve main valve, unloader valve priority valve, 4th check valve, first throttle valve, second throttle and the 3rd flow regulating valve, the connection hydraulic fluid port of outer setting has: power limit valve first hydraulic fluid port, power limit valve second hydraulic fluid port, power limit valve the 3rd hydraulic fluid port, power limit valve the 4th hydraulic fluid port, power limit valve the 5th hydraulic fluid port, power limit valve the 6th hydraulic fluid port and power limit valve return opening, the inner hydraulic fluid port arranged has: unloader valve main valve oil inlet, the control port of unloader valve main valve, first throttle valve oil outlet, right hydraulic control hydraulic fluid port and unloader valve priority valve oil outlet,
First check valve, the second check valve, the 3rd check valve respectively unilaterally connected power limit valve first hydraulic fluid port, power limit valve second hydraulic fluid port, power limit valve the 3rd hydraulic fluid port to unloader valve main valve oil inlet, first check valve, the second check valve, the 3rd check valve form check valve group, unloader valve main valve is communicated with unloader valve main valve oil inlet and power limits valve return opening, and unloader valve main valve control chamber is communicated with the control port of unloader valve main valve;
Unloader valve priority valve is communicated with the control port of unloader valve main valve, unloader valve priority valve oil outlet, unloader valve priority valve both sides limit valve the 4th hydraulic fluid port to be communicated with right hydraulic control hydraulic fluid port respectively with power, the 4th check valve unilaterally connected first throttle valve oil outlet is to the oil circuit of unloader valve main valve control port;
First throttle valve is arranged between power limit valve the 6th hydraulic fluid port and first throttle valve oil outlet, and second throttle is arranged between power limit valve the 5th hydraulic fluid port and right hydraulic control hydraulic fluid port, and the 3rd flow regulating valve is arranged on unloader valve priority valve oil outlet and power is limit between valve return opening;
Power limit valve first hydraulic fluid port, power limit valve second hydraulic fluid port, power limit valve the 3rd hydraulic fluid port, power limit valve the 4th hydraulic fluid port, power limit valve the 5th hydraulic fluid port, power limit valve the 6th hydraulic fluid port are communicated with one-way balance valve second hydraulic fluid port, the first Bidirectional balanced valve first hydraulic fluid port, the second Bidirectional balanced valve first hydraulic fluid port, pressure signal hydraulic fluid port, one-way balance valve second hydraulic fluid port, the second Bidirectional balanced valve second hydraulic fluid port respectively.
Further, also comprise explosion relief valve, explosion relief valve is provided with explosion relief valve first hydraulic fluid port and explosion relief valve second hydraulic fluid port, and explosion relief valve second hydraulic fluid port is communicated with pressure signal hydraulic fluid port; Explosion relief valve first hydraulic fluid port and power limit valve the 4th hydraulic fluid port to be communicated with.
Compared with prior art: the utility model adopts fluid control, without the need to inspection part such as controller, pressure sensor, obliquity sensors, greatly reduces costs; Moment inhibitor valve can limit in conjunction with multiway valve bypass pressure limiting plug-in unit that the first luffing hoists, the first luffing declines, the second luffing hoists, stretches out four actions; Piloted unload valve reliability is high; Explosion relief valve can after booster locking, prevent oil cylinder stall from falling, meet safety rate; Telescopic oil cylinder retract action compulsory commutation power limit state, realizes emergency operation.
Accompanying drawing explanation
Fig. 1 is the utility model hydraulic schematic diagram;
In figure: 1, the first luffing controls connection, the 11, first change-over valve, 12, secondary by pass valve, A1, luffing first hydraulic fluid port, B1, luffing second hydraulic fluid port;
2, the second luffing controls connection, the 21, second change-over valve, A2, two luffing first hydraulic fluid ports, B2, two luffing second hydraulic fluid ports;
3, extension and contraction control connection, the 31, the 3rd change-over valve, A3, flexible first hydraulic fluid port, B3, flexible second hydraulic fluid port;
4, moment inhibitor valve, 41, first check valve, 42, second check valve, 43, 3rd check valve, 44, unloader valve main valve, 45, 4th check valve, 46, first throttle valve, 47, second throttle, 48, 3rd flow regulating valve, 49, unloader valve priority valve, P1, power limit valve first hydraulic fluid port, P2, power limit valve second hydraulic fluid port, P3, power limit valve the 3rd hydraulic fluid port, P4, power limit valve the 4th hydraulic fluid port, P5, unloader valve main valve oil inlet, P6, the control port of unloader valve main valve, P7, first throttle valve oil outlet, P8, right hydraulic control hydraulic fluid port, P9, unloader valve priority valve oil outlet, I, power limit valve the 5th hydraulic fluid port, Pil, power limit valve the 6th hydraulic fluid port, T1, power limit valve return opening,
5, one-way balance valve, V1, one-way balance valve first hydraulic fluid port, V2, one-way balance valve second hydraulic fluid port, C1, one-way balance valve the 3rd hydraulic fluid port, C2, one-way balance valve the 4th hydraulic fluid port, M, pressure signal hydraulic fluid port;
F, explosion relief valve, F1, explosion relief valve first hydraulic fluid port, F2, explosion relief valve second hydraulic fluid port;
6, the first Bidirectional balanced valve, V3, the first Bidirectional balanced valve first hydraulic fluid port, V4, the first Bidirectional balanced valve second hydraulic fluid port, C3, the first Bidirectional balanced valve the 3rd hydraulic fluid port, C4, the first Bidirectional balanced valve the 4th hydraulic fluid port;
7, the second Bidirectional balanced valve, V5, the second Bidirectional balanced valve first hydraulic fluid port, V6, the second Bidirectional balanced valve second hydraulic fluid port, C5, the second Bidirectional balanced valve the 3rd hydraulic fluid port, C6, the second Bidirectional balanced valve the 4th hydraulic fluid port;
8, the first amplitude oil cylinder, the 9, second amplitude oil cylinder, 10, telescopic oil cylinder, T, system oil return mouth.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, this a kind of folding arm lorry-mounted crane fluid control moment limiting system, comprises the first luffing and controls connection 1, second luffing control connection 2, extension and contraction control connection 3, moment inhibitor valve 4, one-way balance valve 5, first Bidirectional balanced valve 6, second Bidirectional balanced valve 7, first amplitude oil cylinder 8, second amplitude oil cylinder 9 and telescopic oil cylinder 10;
First luffing controls connection 1 and comprises the first change-over valve 11 and secondary by pass valve 12, be provided with an a luffing first hydraulic fluid port A1 and luffing second hydraulic fluid port B1, secondary by pass valve 12 is arranged on the oil circuit between a luffing first hydraulic fluid port A1 and system oil return mouth T, the effect of secondary by pass valve 12 is the maximum pressure that hoists of restriction first amplitude oil cylinder 8, thus the maximum lifting capacity of hoisting crane is limited, first luffing control connection 1 for switch the first amplitude oil cylinder 8 pressure oil controlling party to, realize hoisting to the first luffing mechanism, the control of the action that declines, stops;
One-way balance valve 5 is provided with outside hydraulic fluid port: one-way balance valve first hydraulic fluid port V1, one-way balance valve second hydraulic fluid port V2, one-way balance valve the 3rd hydraulic fluid port C1, one-way balance valve the 4th hydraulic fluid port C2 and pressure signal hydraulic fluid port M, one-way balance valve second hydraulic fluid port V2 is communicated with one-way balance valve the 4th hydraulic fluid port C2, pressure signal hydraulic fluid port M is communicated with one-way balance valve the 3rd hydraulic fluid port C1, one-way balance valve the 3rd hydraulic fluid port C1 is communicated with the first amplitude oil cylinder 8 rodless cavity, one-way balance valve the 4th hydraulic fluid port C2 is communicated with the first amplitude oil cylinder 8 rod chamber, one-way balance valve 5 is for controlling static maintenance and the steady fall of the first luffing mechanism,
First luffing controls connection 1, one-way balance valve 5, first amplitude oil cylinder 8 forms the first luffing control system.
Second luffing controls connection 2 and comprises the second change-over valve 21, is provided with two luffing first hydraulic fluid port A2 and two luffing second hydraulic fluid port B2, for the pressure oil controlling party that switches the second amplitude oil cylinder 9 to, realize hoisting to the second luffing mechanism, the control of the action that declines, stops, first Bidirectional balanced valve 6 is provided with the first Bidirectional balanced valve first hydraulic fluid port V3, first Bidirectional balanced valve second hydraulic fluid port V4, first Bidirectional balanced valve the 3rd hydraulic fluid port C3 and the first Bidirectional balanced valve the 4th hydraulic fluid port C4, steadily hoist under can ensureing the second luffing mechanism lotus and decline, first Bidirectional balanced valve first hydraulic fluid port V3 is communicated with two luffing first hydraulic fluid port A2, first Bidirectional balanced valve second hydraulic fluid port V4 is communicated with two luffing second hydraulic fluid port B2, first Bidirectional balanced valve the 3rd hydraulic fluid port C3 is communicated with the rodless cavity of the second amplitude oil cylinder 9, first Bidirectional balanced valve the 4th hydraulic fluid port C4 is communicated with the rod chamber of the second amplitude oil cylinder 9,
Second luffing controls connection 2, first Bidirectional balanced valve 6, second amplitude oil cylinder 9 and forms the second luffing control system.
Extension and contraction control connection 3 comprises the 3rd change-over valve 31, is provided with flexible first hydraulic fluid port A3 and flexible second hydraulic fluid port B3, for switch flexible pressure oil controlling party to, realize stretching out telescopic oil cylinder 10, the control of action of retracting, stop, second Bidirectional balanced valve 7 is provided with the second Bidirectional balanced valve first hydraulic fluid port V5, second Bidirectional balanced valve second hydraulic fluid port V6, second Bidirectional balanced valve the 3rd hydraulic fluid port C5 and the second Bidirectional balanced valve the 4th hydraulic fluid port C6, its effect keeps the static hovering of telescopic boom and easy motion, second Bidirectional balanced valve first hydraulic fluid port V5 is communicated with flexible first hydraulic fluid port A3, second Bidirectional balanced valve second hydraulic fluid port V6 is communicated with flexible second hydraulic fluid port B3, second Bidirectional balanced valve the 3rd hydraulic fluid port C5 is communicated with the rodless cavity of telescopic oil cylinder 10, second Bidirectional balanced valve the 4th hydraulic fluid port C6 is communicated with the rod chamber of telescopic oil cylinder 10,
Extension and contraction control connection the 3, second Bidirectional balanced valve 7, telescopic oil cylinder 10 form telescopic control system.
Moment inhibitor valve 4 comprises the first check valve 41, second check valve 42, 3rd check valve 43, unloader valve main valve 44, unloader valve priority valve 49, 4th check valve 45, first throttle valve 46, second throttle 47 and the 3rd flow regulating valve 48, the connection hydraulic fluid port of outer setting has: power limit valve first hydraulic fluid port P1, power limit valve second hydraulic fluid port P2, power limit valve the 3rd hydraulic fluid port P3, power limit valve the 4th hydraulic fluid port P4, power limit valve the 5th hydraulic fluid port I, power limit valve the 6th hydraulic fluid port Pil and power limit valve oil return inlet T 1, the inner hydraulic fluid port arranged has: unloader valve main valve oil inlet P 5, unloader valve main valve control port P6, first throttle valve oil outlet P7, right hydraulic control hydraulic fluid port P8 and unloader valve priority valve oil outlet P9, the first check valve 41, second check valve 42, 3rd check valve 43 is unilaterally connected power limit valve first hydraulic fluid port P1 respectively, power limit valve second hydraulic fluid port P2, power limit valve the 3rd hydraulic fluid port P3 is to unloader valve main valve oil inlet P 5, first check valve 41, second check valve 42, 3rd check valve 43 forms check valve group, can realize the first check valve 41, three road binders liquid of the second check valve 42 and the 3rd check valve 43, to the nonreturn flow of unloader valve main valve 44 oil inlet, prevent the first check valve 41, mutual interference between second check valve 42 and the 3rd check valve 43.Unloader valve main valve 44 is communicated with unloader valve main valve oil inlet P 5 and limits valve oil return inlet T 1 with power, unloader valve main valve 44 control chamber is communicated with unloader valve main valve control port P6, unloader valve priority valve 49 is communicated with unloader valve main valve control port P6, unloader valve priority valve oil outlet P9, unloader valve priority valve 49 both sides limit valve the 4th hydraulic fluid port P4 to be communicated with right hydraulic control hydraulic fluid port P8 respectively with power, the oil circuit of the 4th check valve 45 unilaterally connected first throttle valve oil outlet P7 to unloader valve main valve control port P6, first throttle valve 46 is arranged between power limit valve the 6th hydraulic fluid port Pil and first throttle valve oil outlet P7, second throttle 47 is arranged between power limit valve the 5th hydraulic fluid port I and right hydraulic control hydraulic fluid port P8, 3rd flow regulating valve 48 is arranged on unloader valve priority valve oil outlet P9 and power is limit between valve oil return inlet T 1,
Power limit valve first hydraulic fluid port P1, power limit valve second hydraulic fluid port P2, power limit valve the 3rd hydraulic fluid port P3, power limit valve the 4th hydraulic fluid port P4, power limit valve the 5th hydraulic fluid port I, power limit valve the 6th hydraulic fluid port Pil are communicated with one-way balance valve second hydraulic fluid port V2, the first Bidirectional balanced valve first hydraulic fluid port V3, the second Bidirectional balanced valve first hydraulic fluid port V5, pressure signal hydraulic fluid port M, one-way balance valve second hydraulic fluid port V2, the second Bidirectional balanced valve second hydraulic fluid port V6 respectively.
In order to avoid oil cylinder when pressure signal hydraulic fluid port M and power limit high-pressure oil passage between valve the 4th hydraulic fluid port P4 to occur booster fault declines rapidly the potential safety hazard caused, limit between valve the 4th hydraulic fluid port P4 at pressure signal hydraulic fluid port M and power and set up explosion relief valve F, explosion relief valve F is provided with explosion relief valve first hydraulic fluid port F1 and explosion relief valve second hydraulic fluid port F2, and explosion relief valve second hydraulic fluid port F2 is communicated with pressure signal hydraulic fluid port M; Power limit valve the 4th hydraulic fluid port P4 is communicated with explosion relief valve first hydraulic fluid port F1, when explosion relief valve first hydraulic fluid port F1 and power limit valve the 4th hydraulic fluid port P4 to be normally connected, explosion relief valve second hydraulic fluid port F2 is normally communicated with between explosion relief valve first hydraulic fluid port F1, the rodless cavity fluid of the first amplitude oil cylinder 8 enters control chamber on the left of unloader valve priority valve 49 through one-way balance valve the 3rd hydraulic fluid port C1, pressure signal hydraulic fluid port M, explosion relief valve second hydraulic fluid port F2, explosion relief valve F, explosion relief valve first hydraulic fluid port F1, power limit valve the 4th hydraulic fluid port P4, achieves the transmission of the rodless cavity pressure of the first amplitude oil cylinder 8; When explosion relief valve first hydraulic fluid port F1 and power limit between valve the 4th hydraulic fluid port P4 due to fault lose be connected time, explosion relief valve F closes under the pressure effect of explosion relief valve second hydraulic fluid port F2, prevent fluid from the flowing through one-way balance valve the 3rd hydraulic fluid port C1, pressure signal hydraulic fluid port M, explosion relief valve second hydraulic fluid port F2 of the rodless cavity of the first amplitude oil cylinder 8, thus keep the static hovering of the first amplitude oil cylinder.
First luffing control system to moment inhibitor valve 4 has three oil circuits, is respectively the first restriction of luffing control system moment oil circuit, the first luffing control system rodless cavity pressure signal oil circuit, the first luffing control system rod chamber pressure signal oil circuit.Wherein, first luffing control system moment restriction oil circuit is a luffing second hydraulic fluid port B1, power limit valve first hydraulic fluid port P1, the first check valve 41, unloader valve main valve oil inlet P 5, unloader valve main valve 44 to power limit valve oil return inlet T 1, and its effect is the off-load oil circuit setting up the first luffing falling motion; First luffing control system rodless cavity pressure signal oil circuit is control chamber on the left of the rodless cavity of the first amplitude oil cylinder 8, one-way balance valve the 3rd hydraulic fluid port C1, one-way balance valve 5, pressure signal hydraulic fluid port M, explosion relief valve second hydraulic fluid port F2, explosion relief valve F, explosion relief valve first hydraulic fluid port F1, power limit valve the 4th hydraulic fluid port P4 to unloader valve priority valve 49, and its effect is that the rodless cavity of the first amplitude oil cylinder 8 is passed to control chamber on the left of unloader valve priority valve 49; First luffing control system rod chamber pressure signal oil circuit is control chamber on the right side of the rod chamber of the first amplitude oil cylinder 8, a luffing second hydraulic fluid port B1, power limit valve the 5th hydraulic fluid port I, second throttle 47, power limit valve right hydraulic control hydraulic fluid port P8 to unloader valve priority valve 49, again through the 3rd flow regulating valve 48 to power limit valve oil return inlet T 1, its effect is that the rod chamber pressure signal of the first amplitude oil cylinder 8 is passed to control chamber on the right side of unloader valve priority valve 49 after second throttle 47, the 3rd flow regulating valve 48 dividing potential drop.
Second luffing control system to moment inhibitor valve 4 has an oil circuit, it is the second luffing control system moment restriction oil circuit, this oil circuit is that the rodless cavity of the second amplitude oil cylinder 9 limits valve oil return inlet T 1 through two luffing first hydraulic fluid port A2, power limit valve second hydraulic fluid port P2, the second check valve 42, unloader valve main valve oil inlet P 5, unloader valve main valve 44 to power, and the second luffing control system off-load oil circuit is set up in its effect.
Telescopic control system to moment inhibitor valve 4 has two oil circuits, and one is telescopic control system moment restriction oil circuit, and another is moment restriction cancellation oil circuit.Wherein, telescopic control system moment restriction oil circuit is that the rodless cavity of telescopic oil cylinder 10 limits valve oil return inlet T 1 through flexible first hydraulic fluid port A3, power limit valve the 3rd hydraulic fluid port P3, the 3rd check valve 43, unloader valve main valve oil inlet P 5, unloader valve main valve 44 to power, and telescopic control system off-load oil circuit is set up in its effect, moment restriction cancellation oil circuit is that the rod chamber of 10 telescopic oil cylinders is through flexible second hydraulic fluid port B3, power limit valve the 6th hydraulic fluid port Pil, first throttle valve 46, 4th check valve 45, unloader valve priority valve oil outlet P9, 3rd flow regulating valve 48, power limit valve oil return inlet T 1 oil sump tank, its effect is to unloader valve main valve 44 control chamber by the rod chamber pressure signal transmission of telescopic oil cylinder 10, 3rd flow regulating valve 48 makes unloader valve main valve 44 control chamber fluid set up pressure, promote unloader valve main valve 44 spool to close, first luffing declines, second luffing hoists, stretch out regular event, moment inhibitor valve 4 reenters non-unloading condition, moment restriction state is removed.
When crane job moment is when rising in lifting moment allowed band, unloader valve priority valve 49 spool is operated in right position under the action of the spring, unloader valve main valve 44 control chamber is through unloader valve main valve control port P6, unloader valve priority valve 49, unloader valve priority valve oil outlet P9, 3rd flow regulating valve 43, the oil circuit of power limit valve oil return inlet T 1 to fuel tank block by unloader valve priority valve 49 spool, moment inhibitor valve 4 is operated in non-unloading condition under the effect of retracing spring, first luffing control system moment restriction oil circuit, second luffing control system moment restriction oil circuit, telescopic control system moment restriction oil circuit is cut off to the oil circuit of fuel tank, all pressure can be set up during work, namely the first luffing declines, second luffing hoists, stretch out three actions all can normally work.
When crane job moment has exceeded lifting moment permissible value, unloader valve priority valve 49 spool is pushed, unloader valve priority valve 49 is operated in left position, unloader valve main valve oil inlet P 5 is connected through the oil circuit of unloader valve main valve 44, unloader valve main valve control port P6, unloader valve priority valve oil outlet P9, the 3rd flow regulating valve 48, power limit valve oil return inlet T 1 to fuel tank, and moment inhibitor valve 4 is operated in unloading condition under oil liquid pressure effect.Now, when the decline of manipulation first luffing, the second luffing hoist, stretch out, first luffing control system moment restriction oil circuit, the second luffing control system moment restriction oil circuit, telescopic control system moment restriction oil circuit are opened to the oil circuit of fuel tank, operation pressure is by off-load, and hoisting crane generation moment limits; When manipulation first luffing rises time, force value exceedes secondary by pass valve 12 setting value, and the first luffing vertical motion is limited; Thus, the first luffing rises, the first luffing declines, the second luffing hoists, stretches out four equal akinesias of action, thus achieves the object of safety guard-safeguard.
Control chamber to the pressure drop of power limit valve oil return inlet T 1 oil circuit and power on the right side of unloader valve priority valve 49 of 3rd flow regulating valve 48 is limit valve the 5th hydraulic fluid port I to limit on the right side of the ratio of the pressure drop of valve oil return inlet T 1 oil circuit and unloader valve priority valve 49 to power to equal the first amplitude oil cylinder 8 rod chamber and this working area ratio of rodless cavity with the product of the ratio of control chamber active area, can eliminate the first amplitude oil cylinder 8 rod chamber pressure to the impact of moment limiting system performance; Moment inhibitor valve 4 guide spring pressure setting value equals hoisting crane maximum operation load pressure;
For further illustrating the principle of work of moment inhibitor valve 4, introduce following formula aid illustration:
Unloader valve priority valve 49 spool stress balance equation is:
………………
In formula:
---the second dash pot valve 47 damping,
---the 3rd dash pot valve 48 damping,
---unloader valve priority valve 49 spring setting pressure,
---control chamber working area on the left of unloader valve priority valve 49,
---control chamber working area on the right side of unloader valve priority valve 49;
When the hoisting moment of folding arm truck-mounted crane not yet reaches the moment of setting, formula
right side value is less than formula
left side value, unloader valve priority valve 49 spool is operated in right position under the action of the spring, unloader valve main valve 44 control chamber is through unloader valve main valve control port P6, unloader valve priority valve 49, unloader valve priority valve oil outlet P9, 3rd flow regulating valve 48, the oil circuit of power limit valve oil return inlet T 1 to fuel tank block by unloader valve priority valve 49 spool, unloader valve main valve oil inlet P 5 to unloader valve main valve control port P6 flows without fluid, moment inhibitor valve 4 is operated in non-unloading condition under the effect of retracing spring, the oil circuit cut-off of unloader valve main valve oil inlet P 5 to power limit valve oil return inlet T 1, first luffing control system moment restriction oil circuit, second luffing control system moment restriction oil circuit, telescopic control system moment restriction oil circuit is cut off to the oil circuit of fuel tank, all pressure can be set up during work, namely the first luffing declines, second luffing hoists, stretch out three actions all can normally work.
When crane job moment has exceeded lifting moment permissible value, formula
right side value equals formula
left side value, unloader valve priority valve 49 spool is pushed, unloader valve priority valve 49 is operated in left position, unloader valve main valve oil inlet P 5 is connected through the oil circuit of unloader valve main valve 44, unloader valve main valve control port P6, unloader valve priority valve 49, unloader valve priority valve oil outlet P9, the 3rd flow regulating valve 48, power limit valve oil return inlet T 1 to fuel tank, pressure reduction is produced between unloader valve main valve oil inlet P 5 and unloader valve main valve control port P6, moment inhibitor valve is operated in unloading condition under oil liquid pressure effect, and the oil circuit of unloader valve main valve oil inlet P 5 to power limit valve oil return inlet T 1 is communicated with.Now, when the decline of manipulation first luffing, the second luffing hoist, stretch out, first luffing control system moment restriction oil circuit, the second luffing control system moment restriction oil circuit, telescopic control system moment restriction oil circuit are opened to the oil circuit of fuel tank, operation pressure is by off-load, and hoisting crane generation moment limits; When manipulation first luffing rises time, force value exceedes secondary by pass valve 12 setting value, and the first luffing vertical motion is limited; Thus, the first luffing rises, the first luffing declines, the second luffing hoists, stretches out four equal akinesias of action, thus achieves the object of safety guard-safeguard.
First amplitude oil cylinder 8 stress balance equation is:
………………
In formula:
---the first amplitude oil cylinder 8 rodless cavity working area,
---the first amplitude oil cylinder 8 rod chamber working area,
---crane job maximum load pressure;
Equation
with equation
show, moment inhibitor valve 4 design meets
, the first amplitude oil cylinder 8 rod chamber pressure can be eliminated on the impact of moment limiting system performance; And moment inhibitor valve 4 guide spring pressure setting value meets
.
This moment limiting system additionally provides the method for a kind of compulsory commutation power limit state.Handle extension and contraction control connection retract action, the emergent oil circuit of removing of moment restriction is activated, pressure oil is through flexible second hydraulic fluid port B3, power limit valve the 6th hydraulic fluid port Pil, first throttle valve 46, 4th check valve 45, unloader valve main valve control port P6, unloader valve priority valve 49, unloader valve priority valve oil outlet P9, 3rd flow regulating valve 48, power limit valve oil return inlet T 1 oil sump tank, 3rd flow regulating valve 48 makes unloader valve main valve 44 control chamber fluid set up pressure, promote unloader valve main valve 44 spool to close, end the oil circuit of unloader valve main valve oil inlet P 5 to power limit valve oil return inlet T 1, make the first luffing decline regular event, moment inhibitor valve 4 reenters non-unloading condition, moment restriction state is removed.
Finally, it is also to be noted that what enumerate above is only a specific embodiment of the present utility model.Obviously, the utility model is not limited to above embodiment, can also have many distortion.All distortion that those of ordinary skill in the art can directly derive from content disclosed in the utility model or associate, all should think protection domain of the present utility model.
Claims (2)
1. a folding arm lorry-mounted crane fluid control moment limiting system, it is characterized in that, comprise the first luffing and control connection (1), the second luffing control connection (2), extension and contraction control connection (3), moment inhibitor valve (4), one-way balance valve (5), the first Bidirectional balanced valve (6), the second Bidirectional balanced valve (7), the first amplitude oil cylinder (8), the second amplitude oil cylinder (9) and telescopic oil cylinder (10);
First luffing controls connection (1) and comprises the first change-over valve (11) and secondary by pass valve (12), be provided with luffing first hydraulic fluid port (A1) and luffing second hydraulic fluid port (B1), secondary by pass valve (12) is arranged on the oil circuit between luffing first hydraulic fluid port (A1) and system oil return mouth (T);
One-way balance valve (5) is provided with outside hydraulic fluid port: one-way balance valve first hydraulic fluid port (V1), one-way balance valve second hydraulic fluid port (V2), one-way balance valve the 3rd hydraulic fluid port (C1), one-way balance valve the 4th hydraulic fluid port (C2) and pressure signal hydraulic fluid port (M), one-way balance valve second hydraulic fluid port (V2) is communicated with one-way balance valve the 4th hydraulic fluid port (C2), pressure signal hydraulic fluid port (M) is communicated with one-way balance valve the 3rd hydraulic fluid port (C1), one-way balance valve the 3rd hydraulic fluid port (C1) is communicated with the first amplitude oil cylinder (8) rodless cavity, one-way balance valve the 4th hydraulic fluid port (C2) is communicated with the first amplitude oil cylinder (8) rod chamber,
Second luffing controls connection (2) and comprises the second change-over valve (21), is provided with two luffing first hydraulic fluid ports (A2) and two luffing second hydraulic fluid ports (B2);
First Bidirectional balanced valve (6) is provided with the first Bidirectional balanced valve first hydraulic fluid port (V3), first Bidirectional balanced valve second hydraulic fluid port (V4), first Bidirectional balanced valve the 3rd hydraulic fluid port (C3) and the first Bidirectional balanced valve the 4th hydraulic fluid port (C4), first Bidirectional balanced valve first hydraulic fluid port (V3) is communicated with two luffing first hydraulic fluid ports (A2), first Bidirectional balanced valve second hydraulic fluid port (V4) is communicated with two luffing second hydraulic fluid ports (B2), first Bidirectional balanced valve the 3rd hydraulic fluid port (C3) is communicated with the rodless cavity of the second amplitude oil cylinder (9), first Bidirectional balanced valve the 4th hydraulic fluid port (C4) is communicated with the rod chamber of the second amplitude oil cylinder (9),
Extension and contraction control connection (3) comprises the 3rd change-over valve (31), is provided with flexible first hydraulic fluid port (A3) and flexible second hydraulic fluid port (B3);
Second Bidirectional balanced valve (7) is provided with the second Bidirectional balanced valve first hydraulic fluid port (V5), second Bidirectional balanced valve second hydraulic fluid port (V6), second Bidirectional balanced valve the 3rd hydraulic fluid port (C5) and the second Bidirectional balanced valve the 4th hydraulic fluid port (C6), second Bidirectional balanced valve first hydraulic fluid port (V5) is communicated with flexible first hydraulic fluid port (A3), second Bidirectional balanced valve second hydraulic fluid port (V6) is communicated with flexible second hydraulic fluid port (B3), second Bidirectional balanced valve the 3rd hydraulic fluid port (C5) is communicated with the rodless cavity of telescopic oil cylinder (10), second Bidirectional balanced valve the 4th hydraulic fluid port (C6) is communicated with the rod chamber of telescopic oil cylinder (10),
Moment inhibitor valve (4) comprises the first check valve (41), second check valve (42), 3rd check valve (43), unloader valve main valve (44), unloader valve priority valve (49), 4th check valve (45), first throttle valve (46), second throttle (47) and the 3rd flow regulating valve (48), the connection hydraulic fluid port of outer setting has: power limit valve first hydraulic fluid port (P1), power limit valve second hydraulic fluid port (P2), power limit valve the 3rd hydraulic fluid port (P3), power limit valve the 4th hydraulic fluid port (P4), power limit valve the 5th hydraulic fluid port (I), power limit valve the 6th hydraulic fluid port (Pil) and power limit valve return opening (T1), the inner hydraulic fluid port arranged has: unloader valve main valve oil inlet (P5), unloader valve main valve control port (P6), first throttle valve oil outlet (P7), right hydraulic control hydraulic fluid port (P8) and unloader valve priority valve oil outlet (P9),
First check valve (41), the second check valve (42), the 3rd check valve (43) respectively unilaterally connected power limit valve first hydraulic fluid port (P1), power limit valve second hydraulic fluid port (P2), power limit valve the 3rd hydraulic fluid port (P3) to unloader valve main valve oil inlet (P5), first check valve (41), the second check valve (42), the 3rd check valve (43) form check valve group, unloader valve main valve (44) is communicated with unloader valve main valve oil inlet (P5) and limits valve return opening (T1) with power, and unloader valve main valve (44) control chamber is communicated with unloader valve main valve control port (P6);
Unloader valve priority valve (49) is communicated with unloader valve main valve control port (P6), unloader valve priority valve oil outlet (P9), unloader valve priority valve (49) both sides limit valve the 4th hydraulic fluid port (P4) to be communicated with right hydraulic control hydraulic fluid port (P8) respectively with power, the 4th check valve (45) unilaterally connected first throttle valve oil outlet (P7) is to the oil circuit of unloader valve main valve control port (P6);
First throttle valve (46) is arranged between power limit valve the 6th hydraulic fluid port (Pil) and first throttle valve oil outlet (P7), second throttle (47) is arranged between power limit valve the 5th hydraulic fluid port (I) and right hydraulic control hydraulic fluid port (P8), and the 3rd flow regulating valve (48) is arranged on unloader valve priority valve oil outlet (P9) and power is limit between valve return opening (T1);
Power limit valve first hydraulic fluid port (P1), power limit valve second hydraulic fluid port (P2), power limit valve the 3rd hydraulic fluid port (P3), power limit valve the 4th hydraulic fluid port (P4), power limit valve the 5th hydraulic fluid port (I), power limit valve the 6th hydraulic fluid port (Pil) respectively with one-way balance valve second hydraulic fluid port (V2), first Bidirectional balanced valve first hydraulic fluid port (V3), second Bidirectional balanced valve first hydraulic fluid port (V5), pressure signal hydraulic fluid port (M), one-way balance valve second hydraulic fluid port (V2), second Bidirectional balanced valve second hydraulic fluid port (V6) is communicated with.
2. a kind of folding arm lorry-mounted crane fluid control moment limiting system according to claim 1, it is characterized in that, also comprise and explosion relief valve (F), explosion relief valve (F) is provided with explosion relief valve first hydraulic fluid port (F1) and explosion relief valve second hydraulic fluid port (F2), and explosion relief valve second hydraulic fluid port (F2) is communicated with pressure signal hydraulic fluid port (M); Explosion relief valve first hydraulic fluid port (F1) and power limit valve the 4th hydraulic fluid port (P4) to be communicated with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520017730.2U CN204490382U (en) | 2015-01-12 | 2015-01-12 | Folding arm lorry-mounted crane fluid control moment limiting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520017730.2U CN204490382U (en) | 2015-01-12 | 2015-01-12 | Folding arm lorry-mounted crane fluid control moment limiting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204490382U true CN204490382U (en) | 2015-07-22 |
Family
ID=53569670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520017730.2U Withdrawn - After Issue CN204490382U (en) | 2015-01-12 | 2015-01-12 | Folding arm lorry-mounted crane fluid control moment limiting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204490382U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104555766A (en) * | 2015-01-12 | 2015-04-29 | 徐州徐工随车起重机有限公司 | Hydraulic control moment restriction system of folding arm lorry-mounted crane |
| CN107337124A (en) * | 2017-08-17 | 2017-11-10 | 中联重科股份有限公司 | Crane and its arm of derrick control method and control system |
| CN108382281A (en) * | 2018-04-13 | 2018-08-10 | 江苏高德液压机械有限公司 | The dumper that band is grabbed with vehicle |
-
2015
- 2015-01-12 CN CN201520017730.2U patent/CN204490382U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104555766A (en) * | 2015-01-12 | 2015-04-29 | 徐州徐工随车起重机有限公司 | Hydraulic control moment restriction system of folding arm lorry-mounted crane |
| CN104555766B (en) * | 2015-01-12 | 2016-08-24 | 徐州徐工随车起重机有限公司 | A kind of folding arm lorry-mounted crane hydraulic control moment limiting system |
| CN107337124A (en) * | 2017-08-17 | 2017-11-10 | 中联重科股份有限公司 | Crane and its arm of derrick control method and control system |
| CN107337124B (en) * | 2017-08-17 | 2019-04-19 | 中联重科股份有限公司 | Crane and its arm of derrick control method and control system |
| CN108382281A (en) * | 2018-04-13 | 2018-08-10 | 江苏高德液压机械有限公司 | The dumper that band is grabbed with vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204490382U (en) | Folding arm lorry-mounted crane fluid control moment limiting system | |
| CN106379827B (en) | A kind of hydraulic winch rope length controls hydraulic pressure tension system | |
| CN209100375U (en) | A kind of hydraulic system of high-altitude operation vehicle cantilever crane | |
| CN103644172A (en) | Device and method for detecting and protecting telescopic oil cylinder of crane | |
| CN104555766A (en) | Hydraulic control moment restriction system of folding arm lorry-mounted crane | |
| CN105544631B (en) | A kind of control loop of hydraulic shovel equipment | |
| CN103922250B (en) | Working bucket leveling system and folding arm high-altitude operation vehicle | |
| CN103641023B (en) | The hydraulic control system of control cock and hoist brake, hoisting crane | |
| CN104088830B (en) | The hydraulic system and its pilot-operated type control valve of a kind of crane | |
| CN101994727B (en) | Balance valve having two-stage pressure buffering protection function | |
| CN201925255U (en) | Balancing valve with secondary pressure buffering protection function | |
| CN204549858U (en) | Hydraulic efficiency pressure system and hoisting crane | |
| CN201737609U (en) | Simple moment limit device | |
| CN1970426A (en) | Differential pressure control method for preventing crane secondary lifting and sliding | |
| CN204003694U (en) | A kind of hydraulic system of hoist and pilot-operated type control valve thereof | |
| CN104847726A (en) | Terminal removing type moment limiting valve and hydraulic-control moment limiting system with the same | |
| CN203532391U (en) | Balance valve group, winching pilot-operated loop and engineering machine | |
| CN202579392U (en) | Hydraulic control valve and a fire truck upper truck hydraulic system provided with same | |
| CN103663152B (en) | Mast rising-falling control system, method and apparatus, super-lift apparatus and crane | |
| CN203845742U (en) | Control valve, hydraulic control system for hoisting brakes and crane | |
| CN202864722U (en) | Crane and hydraulic control system of super lifting device thereof | |
| CN102295199B (en) | Power pump station for hydraulic elevator/hydraulic lift | |
| CN104386597B (en) | Anti-impact electromagnetic unloading valve of straight-arm lorry-mounted crane | |
| CN203754313U (en) | Anti-back-tipping device and swing arm tower crane with same | |
| CN109132891B (en) | Elevator telescopic hydraulic control system and engineering machinery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150722 Effective date of abandoning: 20160824 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |